#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>


int main(int argc, char* argv[], char* envp[])
{
    extern char** environ;
    char* ret = getenv("myval");
    if(ret)
        printf("%s\n",ret);
    else
        printf("NULL\n");
    //for(int i = 0; environ[i]; i++)
    //{
    //    printf("%s\n",environ[i]);
    //}
    return 0;
}
